Kongo-do Tokkyu-hin

Artificial stone, substitute for Ara-to.
1st stone of the groundwork, used before Binsui-do.
Kongo-do is used when the sword has rust or flaw.
We have several types of Kongo-do, so please choose the one according to the condition of the sword.
Kongo-do Tokkyu-hin is loved by many professional polishers as it can whet very fast and efficiently.
The particle is made uniform, so you you can polish the blade equally.